crypto/ext4crypt/ext4crypt_tar.h

/*
 * Copyright (C) 2016 Team Win Recovery Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __EXT4CRYPT_TAR_H
#define __EXT4CRYPT_TAR_H

#include <sys/cdefs.h>
#include <stdbool.h>
#include <cutils/multiuser.h>

// ext4enc:TODO Include structure from somewhere sensible
// MUST be in sync with ext4_crypto.c in kernel
#define EXT4_KEY_DESCRIPTOR_SIZE 8
#define EXT4_KEY_DESCRIPTOR_SIZE_HEX 17

// ext4enc:TODO Get value from somewhere sensible
#define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy)
#define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)

__BEGIN_DECLS

struct ext4_encryption_policy {
    char version;
    char contents_encryption_mode;
    char filenames_encryption_mode;
    char flags;
    char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
} __attribute__((__packed__));

bool lookup_ref_key(const char* policy, char* policy_type);
bool lookup_ref_tar(const char* policy_type, char* policy);

void policy_to_hex(const char* policy, char* hex);
bool e4crypt_policy_set(const char *directory, const char *policy,
                               size_t policy_length, int contents_encryption_mode);
bool e4crypt_policy_get(const char *directory, char *policy,
                               size_t policy_length, int contents_encryption_mode);
void e4crypt_policy_fill_default_struct(struct ext4_encryption_policy *eep);
bool e4crypt_policy_set_struct(const char *directory, const struct ext4_encryption_policy *eep);
bool e4crypt_policy_get_struct(const char *directory, struct ext4_encryption_policy *eep);

bool e4crypt_set_mode();
__END_DECLS

#endif